# Global 100 Forum

> Global 100 Forum collects real questions and worked answers on AI detection, deepfakes and content authenticity.

Threads open with a short, self-contained answer, then the discussion. Posts marked Staff are written by the forum team and cite primary sources. Dates on every post are machine-readable. Each thread is also available as Markdown: replace the trailing slash of its URL with `.md`.

## [AI text detection](https://forum.global100.org/f/ai-text-detection/)
How AI text detectors score writing, the error rates independent tests report, where they fail on edited text, and how to read a result.

- [Do AI detectors work on code (GitHub Copilot, programming assignments)?](https://forum.global100.org/q/do-ai-detectors-work-on-code-github-copilot-programming-assignments/): I TA a writing course, but this term I also picked up grading for an introductory Python course and I have run into something I do not know how to think about.
- [Does watermarking AI-generated text actually work?](https://forum.global100.org/q/does-watermarking-ai-generated-text-actually-work/): It works when the model provider builds it in and the text is not heavily edited, which makes it far more reliable than guessing from style.
- [Are AI detectors biased against non-native English writers?](https://forum.global100.org/q/are-ai-detectors-biased-against-non-native-english-writers/): Yes, there is good evidence that they can be.
- [How accurate are AI text detectors, really?](https://forum.global100.org/q/how-accurate-are-ai-text-detectors-really/): Less accurate than their marketing suggests, and far less reliable on edited or paraphrased text.

## [Detector tools compared](https://forum.global100.org/f/detector-tools/)
GPTZero, Turnitin, Copyleaks, Originality, QuillBot, Grammarly and ZeroGPT: what each one measures, how accurate it is in tests, and why they disagree.

- [Why do GPTZero, ZeroGPT, QuillBot and Grammarly give different AI scores?](https://forum.global100.org/q/why-do-gptzero-zerogpt-quillbot-and-grammarly-give-different-ai-scores/): They disagree because they are answering different questions with different models, different training data and different cut-offs.
- [Is GPTZero accurate compared with Turnitin, Copyleaks and Originality.ai?](https://forum.global100.org/q/is-gptzero-accurate-compared-with-turnitin-copyleaks-and-originalityai/): GPTZero is accurate enough to flag obvious, unedited chatbot output and not accurate enough to prove anything on its own.

## [Turnitin, Canvas and schools](https://forum.global100.org/f/turnitin-and-schools/)
Which detectors colleges and teachers actually use, how the Turnitin AI writing report works, and what Canvas and Google Classroom do not check.

- [Why does Grammarly (or spell-check and editing) make my essay score as AI?](https://forum.global100.org/q/why-does-grammarly-or-spell-check-and-editing-make-my-essay-score/): I am a second-year international student and English is my third language.
- [What AI detector do colleges and teachers actually use, if any?](https://forum.global100.org/q/what-ai-detector-do-colleges-and-teachers-actually-use-if-any/): Most institutions that check for AI do it through Turnitin, because it already sits inside their learning platform.
- [Does Turnitin check for AI, and what does the instructor actually see?](https://forum.global100.org/q/does-turnitin-check-for-ai-and-what-does-the-instructor-actually-see/): Yes, if the institution licenses and enables it.

## [Academic integrity](https://forum.global100.org/f/academic-integrity/)
Detector flags in coursework, due process for students, how to document your own writing process, appeals, and the policy choices instructors face.

- [Can a teacher prove I used AI if I have my Google Docs version history?](https://forum.global100.org/q/can-a-teacher-prove-i-used-ai-if-i-have-my-google-docs-version-history/): My daughter is 16.
- [What should a student do if an AI detector flags their work?](https://forum.global100.org/q/what-should-a-student-do-if-an-ai-detector-flags-their-work/): Stay calm, gather evidence of how you wrote the work, and ask for the specific basis of the concern in writing.

## [AI images and photos](https://forum.global100.org/f/ai-images/)
Telling whether a picture is AI generated: the visual tells, the detector tools, and what metadata can and cannot prove.

- [Are AI image detectors reliable, and what do the tests show?](https://forum.global100.org/q/are-ai-image-detectors-reliable-and-what-do-the-tests-show/): The best commercial detectors score very well on images from generators they were trained on, and much worse on new generators, edited images and adversarial protection.
- [How can you tell if an image is AI generated?](https://forum.global100.org/q/how-can-you-tell-if-an-image-is-ai-generated/): Usually you cannot tell with certainty from the pixels alone.

## [Deepfakes and video](https://forum.global100.org/f/deepfakes-and-media/)
Synthetic faces and edited video: what people can and cannot spot by eye, how deepfake detectors work, and the conditions under which they fail.

- [How do I verify a viral video is real before my newsroom runs it?](https://forum.global100.org/q/how-do-i-verify-a-viral-video-is-real-before-my-newsroom-runs-it/): Photo editor at a mid-sized daily here.
- [Can people reliably spot an AI-generated face just by looking?](https://forum.global100.org/q/can-people-reliably-spot-an-ai-generated-face-just-by-looking/): No.

## [AI voice and audio](https://forum.global100.org/f/ai-voice/)
Cloned voices, scam calls and audio deepfakes: how voice detection works and what to check before you trust a recording.

- [How accurate are AI voice detectors in real conditions?](https://forum.global100.org/q/how-accurate-are-ai-voice-detectors-in-real-conditions/): In controlled benchmarks the best systems miss only a few percent of fakes, but accuracy collapses on audio from unseen generators, phone codecs and real-world recordings, where published tests show e
- [How do you tell if a voice recording or call is AI cloned?](https://forum.global100.org/q/how-do-you-tell-if-a-voice-recording-or-call-is-ai-cloned/): You mostly cannot tell by ear, and neither can the detection tools with certainty.

## [Provenance and C2PA](https://forum.global100.org/f/provenance-and-c2pa/)
Content Credentials, C2PA manifests, watermarks and signed capture: proving where a file came from and how it was edited instead of guessing from pixels.

- [Does Google's SynthID or Content Credentials show up when I download an image from Gemini or ChatGPT?](https://forum.global100.org/q/does-googles-synthid-or-content-credentials-show-up-when-i-download/): Copywriter.
- [What is C2PA, and do Content Credentials actually help?](https://forum.global100.org/q/what-is-c2pa-and-do-content-credentials-actually-help/): C2PA is an open standard for attaching signed, tamper-evident information about where a piece of media came from and how it was edited.

## [Humanizers and rewriting](https://forum.global100.org/f/humanizers-and-rewriting/)
Paraphrasers and humanizers: what they change in a text, how detectors respond in published tests, and where the line sits for honest use.

- [Is using a paraphrasing or humanizing tool academic misconduct?](https://forum.global100.org/q/is-using-a-paraphrasing-or-humanizing-tool-academic-misconduct/): It depends on what the assessment allows and whether you disclosed it.
- [Do AI humanizers and paraphrasers actually beat AI detectors?](https://forum.global100.org/q/do-ai-humanizers-and-paraphrasers-actually-beat-ai-detectors/): Often, yes, at least for a while: published attacks show that paraphrasing AI text sharply cuts detection rates on most style-based detectors.

## [Policy, law and disclosure](https://forum.global100.org/f/policy-and-law/)
Deepfake laws by jurisdiction, platform labelling rules, AI disclosure obligations, and what is legal to make, share or report, with links to the statutes.

- [Do you have to disclose AI-generated content, and who requires labels?](https://forum.global100.org/q/do-you-have-to-disclose-ai-generated-content-and-who-requires-labels/): Increasingly yes, depending on where you publish and what the content is.
- [Is it illegal to make or share a deepfake of someone?](https://forum.global100.org/q/is-it-illegal-to-make-or-share-a-deepfake-of-someone/): Sometimes, and the law is tightening fast.

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